S/MIME Capabilities for Public Key Definitions
RFC 6664
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RFC - Informational
(July 2012; No errata)
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2015-10-14
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IETF
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RFC 6664 (Informational)
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Consensus Boilerplate |
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Sean Turner
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Document Shepherd: Stephen Kent (kent@bbn.com)
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Internet Engineering Task Force (IETF) J. Schaad
Request for Comments: 6664 Soaring Hawk Consulting
Category: Informational July 2012
ISSN: 2070-1721
S/MIME Capabilities for Public Key Definitions
Abstract
This document defines a set of Secure/Multipurpose Internet Mail
Extensions (S/MIME) Capability types for ASN.1 encoding for the
current set of public keys defined by the PKIX working group. This
facilitates the ability for a requester to specify information on the
public keys and signature algorithms to be used in responses.
"Online Certificate Status Protocol Algorithm Agility" (RFC 6277)
details an example of where this is used.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6664.
Copyright Notice
Copyright (c) 2012 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Schaad Informational [Page 1]
RFC 6664 S/MIME Capabilities for Public Keys July 2012
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. ASN.1 Notation . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Requirements Terminology . . . . . . . . . . . . . . . . . 4
2. RSA Public Keys . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Generic RSA Public Keys . . . . . . . . . . . . . . . . . 4
2.2. RSASSA-PSS Signature Public Keys . . . . . . . . . . . . . 5
2.3. RSAES-OAEP Key Transport Public Keys . . . . . . . . . . . 6
3. Diffie-Hellman Keys . . . . . . . . . . . . . . . . . . . . . 7
3.1. DSA Signature Public Key . . . . . . . . . . . . . . . . . 7
3.2. DH Key Agreement Keys . . . . . . . . . . . . . . . . . . 8
4. Elliptic Curve Keys . . . . . . . . . . . . . . . . . . . . . 8
4.1. Generic Elliptic Curve Keys . . . . . . . . . . . . . . . 9
4.2. Elliptic Curve DH Keys . . . . . . . . . . . . . . . . . . 10
4.3. Elliptic Curve MQV Keys . . . . . . . . . . . . . . . . . 10
5. RSASSA-PSS Signature Algorithm Capability . . . . . . . . . . 10
6. Security Considerations . . . . . . . . . . . . . . . . . . . 12
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
7.1. Normative References . . . . . . . . . . . . . . . . . . . 13
7.2. Informative References . . . . . . . . . . . . . . . . . . 13
Appendix A. 2008 ASN.1 Module . . . . . . . . . . . . . . . . . . 15
Appendix B. 1988 ASN.1 Module . . . . . . . . . . . . . . . . . . 18
Appendix C. Future Work . . . . . . . . . . . . . . . . . . . . . 19
1. Introduction
In the process of dealing with the Online Certificate Status Protocol
(OCSP) agility issues in [RFC6277], it was noted that we really
wanted to describe information to be used in selecting a public key,
but we did not have any way of doing so. This document fills that
hole by defining a set of Secure/Multipurpose Internet Mail
Extensions (S/MIME) Capability types for a small set of public key
representations.
S/MIME capabilities were originally defined in [SMIMEv3-MSG] as a way
for the sender of an S/MIME message to tell the recipient of the
message the set of encryption algorithms that were supported by the
sender's system. In the beginning, the focus was primarily on
communicating the set of encryption algorithms that were supported by
the sender. Over time, it was expanded to allow for an S/MIME client
to state that it supported new features such as the compression data
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